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TWC: Lambda Control and OBD without Lambda Probe - An Initial Approach
Technical Paper
2008-01-0916
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
To determine the oxygen storage capacity of three-way catalysts in gasoline-operated vehicles, lambda probes are best practice to measure the A/F ratio of the exhaust for monitoring indirectly the conversion efficiency. In this paper, initial tests of a novel approach are described to determine the oxygen loading of the TWC more directly by means of radio frequency without the use of lambda probes. Experiments in synthetic exhaust gas as well as dynamometer tests using ceria-containing commercial catalysts showed that characteristic parameters of the radio-frequency signal coincide with the oxidation/reduction state of the TWC.
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Authors
- Ralf Moos - Bayreuth Engine Research Center, University of Bayreuth, Bayreuth, Germany
- Matthias Spörl - Bayreuth Engine Research Center, University of Bayreuth, Bayreuth, Germany
- Gunter Hagen - Bayreuth Engine Research Center, University of Bayreuth, Bayreuth, Germany
- Andreas Gollwitzer - Bayreuth Engine Research Center, University of Bayreuth, Bayreuth, Germany
- Marion Wedemann - Bayreuth Engine Research Center, University of Bayreuth, Bayreuth, Germany
- Gerhard Fischerauer - Bayreuth Engine Research Center, University of Bayreuth, Bayreuth, Germany
Citation
Moos, R., Spörl, M., Hagen, G., Gollwitzer, A. et al., "TWC: Lambda Control and OBD without Lambda Probe - An Initial Approach," SAE Technical Paper 2008-01-0916, 2008, https://doi.org/10.4271/2008-01-0916.Also In
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